US 11,746,011 B2
Reverse flow reactors with selective flue gas cascade
Everett J. O'Neal, Asbury, NJ (US); and Anastasios I. Skoulidas, Pittstown, NJ (US)
Assigned to EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY, Annandale, NJ (US)
Filed by ExxonMobil Technology and Engineering Company, Annandale, NJ (US)
Filed on Apr. 2, 2020, as Appl. No. 16/838,477.
Claims priority of provisional application 62/837,923, filed on Apr. 24, 2019.
Prior Publication US 2020/0339417 A1, Oct. 29, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C01B 3/38 (2006.01); B01J 8/04 (2006.01); B01J 19/00 (2006.01); B01J 19/24 (2006.01)
CPC C01B 3/38 (2013.01) [B01J 8/0438 (2013.01); B01J 19/0013 (2013.01); B01J 19/2445 (2013.01); B01J 2219/00038 (2013.01); B01J 2219/00157 (2013.01); C01B 2203/0233 (2013.01); C01B 2203/0811 (2013.01); C01B 2203/1241 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for operating a plurality of reactors, comprising:
reacting a first mixture comprising fuel and 0.1 vol % or more of O2 under first combustion conditions in a first combustion zone within a first reactor to form a first flue gas comprising a first temperature of 400° C. or more, and to heat one or more surfaces in a first reaction zone to a regenerated surface temperature of 800° C. or more, the first reaction zone comprising a catalyst composition;
passing at least a portion of the first flue gas into a second reactor;
reacting a second mixture comprising fuel, 0.1 vol % or more of O2, and the at least a portion of the first flue gas under second combustion conditions in a second combustion zone within the second reactor to form a second flue gas having a temperature between 200° C. and the first temperature, and to heat one or more surfaces in a second reaction zone; exposing a first reactant stream to the one or more surfaces in the first reaction zone to increase the temperature of the first reactant stream; and
exposing the first reactant stream to the catalyst composition in the first reaction zone at a temperature of 800° C. or more to form a first product stream, a direction of flow for the first reactant stream within the first reaction zone being reversed relative to a direction of flow for the first mixture,
wherein the first combustion conditions comprise a first pressure and the second combustion conditions comprise a second pressure, the first pressure being greater than the second pressure by 100 kPa or more.